I have also had that happen to me. If the clerk catches the flaw, they either give you extra or give you a discount on the price. Sometimes you can work with the flaw and if so you can save a bunch of money. Since the fabric was only $3.00 in the first place, it sounds like it was already discounted.
Sue

I have had a lot happen at Joanns, so I watch them pretty close. But you can't always catch everything especially on the underside. I was buying fabric that was flawed, big seam in the middle, she was just going to ignore that seam and charge me for it. I called her on it. Another time the fabric had spots the dye wasn't good, had to go back and tell her, I did get a discount on that. But have never had a problem at Hancocks. No I don't work for Hancocks, I have just had way to many problems with my fabric, clerks and all around business with Joanns, that I don't even go in there unless its absolutely necessary.